12HT piston cooling possible on 2H?

[Christian]

Hi All!

I have a question and a request.

Since the 12HT and the 2H are supposed to be based on the same block, IMO it should be possible to mount the 12HT piston cooling (the oil-squiting) on the 2H. I haven't got a clue as to how the 12HT system looks or where it's mounted.

Does anyone have any photos?

Has anyone done this?

As you all might guess, or know, I'm turboing a 2H.


Merry X-mas and all that...

 

[brownbear]

Download MattF's good manual and have a boo.

Master Portal - forums.bauchan.org/Info

 

[brownbear]

Keep trying till you get a slot.

 

[Christian]

Thanks Brownbear! Ill keep trying!

(Btw I have searched here, a few dead threads on the subject, but no answer)

 

[brownbear]

(Btw I have searched here, a few dead threads on the subject, but no answer)

some things are hard to search. The forum software does not allow two digits or two letter searches. So you can't search 2H or 3B. So you end up with a lot of crap threads to filter thru. It is a pet peeve of mine.

 

[pantheas18_hj47]

you can use google etc to seasrch the wedsite - advanced search

it was a peeve of mine to BB

 

[bigbrowndog]

Hi All!

I have a question and a request.

Since the 12HT and the 2H are supposed to be based on the same block, IMO it should be possible to mount the 12HT piston cooling (the oil-squiting) on the 2H. I haven't got a clue as to how the 12HT system looks or where it's mounted.

Does anyone have any photos?

Has anyone done this?

As you all might guess, or know, I'm turboing a 2H.


Merry X-mas and all that...

Yes, It has been done heaps of times here, but it is not the bottom that is the problem. They turn the block upside down and machine it and drill and tap the holes for the nozzles at the same angle as the 12ht and screw in the nozzles.Sama sama.LOL. Better to spend the money on a set of Hypatec pistons with the steel backing below the oil rings. Get the set with the big gudgeon pin and fit the heavier 12ht con rods. I posted a picture of these pistons a while ago in one of the 3Bs are better than 2H threads LOL. cheers

 

[watrob]

Hi,

One does not usually turbo a 2H, especially the early models. The later models have a oil pickup for a turbo but no return as a 12Ht has, the early models do not have this pickup at all.

Rule of thumb is you do not turbo an early high milege 2H, they overheat, crack heads and damage pistons.

2H compression is 20.5, a 12Ht compression ia around 18.7.

The 12Ht is designed for a turbo, the 12HT has a different crankcase, conrods, pistons and head. A 2H is sleeved where the 12HT is not, the 12Ht has oil-squirting the 2H is not.

I would not turbo my 2H, if I did I would buy a second 2H, get a full reco kit $900 ( sleeves, pistons, bearings, gaskets etc) a 2H motor you can buy for $2,200, a turbo kit is around $1850 = nearly $5,000 and that's not including labour.

You can buy a 12Ht for $5,400.

It's not worth turboing a 2H unless you do it correctly and in that case you may as well buy a 12HT. The 2h motors finished production in 1989, whereas the 12HT were still produced in the very early 1990's

I plan I buying a 12Ht and a reco kit for it and keeping it in storage until my 2H reco motor dies. The problem is the resto I have done will probably last another 30 years in which case I will be dead before I get to use it.

The 12Ht is a nice motor, 135HP good for 500.000klm plus, if I was out on a trail I would prefer a 12HT to a turbo'd 2H, proven motor, reliable and tuff.

Anyway that's my $0.02

 

[Christian]

Hi again Brownbear, Thanks for the link, I really needed that!

Better to spend the money on a set of Hypatec pistons with the steel backing below the oil rings. Get the set with the big gudgeon pin and fit the heavier 12ht con rods. I posted a picture of these pistons a while ago in one of the 3Bs are better than 2H threads LOL. cheers

Thanks Bigbrowndog, I have seen your pics of the pistons, but a google search on them doesn't even give the manufacturer!

On the oil-squirt cooling issue I've reached the conclusion that its not necesary at all! New manufacturing methods enables pistons to release or reflect heat much better. A quote from Mahles homepage:

"In contrast to salt core cooling channels, this new MAHLE solution enables a significantly better cooling of the critical areas. Similar to the transition which took place from spray cooled pistons to salt core cooling channels. MAHLE regards the diesel piston with cooled ring carrier as a pioneering innovation in technology. The series production of this piston started in 2001. By 2006, more than eight million pistons with cooled ring carriers had been produced - in 2007, MAHLE anticipates a volume of another two million."

So it is right, use better pistons, and drop the oilspray!

 

[Christian]

Hi,

One does not usually turbo a 2H, especially the early models. The later models have a oil pickup for a turbo but no return as a 12Ht has, the early models do not have this pickup at all.

I bought a late model, with a turbo already fitted, so no worries there

Rule of thumb is you do not turbo an early high milege 2H, they overheat, crack heads and damage pistons.

As you know I have been looking for a head, you send me the Ebay link, but freight was not feasable

2H compression is 20.5, a 12Ht compression ia around 18.7.

The 12Ht is designed for a turbo, the 12HT has a different crankcase, conrods, pistons and head. A 2H is sleeved where the 12HT is not, the 12Ht has oil-squirting the 2H is not.

Actually the crankcase is the same, the 12HYT has a stiffening plate though. Newer piston designs eliminates the need for oil-jets.

I would not turbo my 2H, if I did I would buy a second 2H, get a full reco kit $900 ( sleeves, pistons, bearings, gaskets etc) a 2H motor you can buy for $2,200, a turbo kit is around $1850 = nearly $5,000 and that's not including labour.

You can buy a 12Ht for $5,400.

It is impossible to find a good 12HT here, they all need a lot of work, work that has already been done on my 2H

It's not worth turboing a 2H unless you do it correctly and in that case you may as well buy a 12HT. The 2h motors finished production in 1989, whereas the 12HT were still produced in the very early 1990's

It will be done the right way, I have a Garrett turbo that will go on ebay, and I plan to use a variable turbo to get optimum boost in the entire rev-range

I plan I buying a 12Ht and a reco kit for it and keeping it in storage until my 2H reco motor dies. The problem is the resto I have done will probably last another 30 years in which case I will be dead before I get to use it.

If I could undo buying the 2H I would, but now I will stick with it and see how well I can get it to perform.

The 12Ht is a nice motor, 135HP good for 500.000klm plus, if I was out on a trail I would prefer a 12HT to a turbo'd 2H, proven motor, reliable and tuff.

Anyway that's my $0.02

Thanks alot, and thanks for the Ebay link!

 

[Tapage]

I'm running a 2H turbo .. now from a Year, some play with the IP and I have great results .. I can compare it with a stock 1HD-T engine .. I really like it ..

Maybe too soon to talk about reliability ..

 

[TLC Norway]

we are lots of heavy pumped 2H's here in norway with homemade turbo and ic setups.
Mine has both. No engine/pistons mod. passing 500 000klm soon, so do others. This setup has been on my rig for about 250-300 000klm!
Most of us are running 0-8 to 1.4 boost.

 

[Dougal]

Indirect injection motors don't have as big a problem with piston cooling as direct injection motors. In direct injection the piston bowl gives a lot more surface area for heat to get in and right down into the piston too.
IDI engines have a mostly flat top so the pistons are harder to heat to destruction.

 

[rchalmers3]

Thread revival in progress!

Anyone have a source in the states for upgraded pistons and recon kits for the 2H?

Rick

 

[Christian]

Holy thread revival Batman!

I have no idea about the upgrated pistons, the original HJ60 project has been scrapped, but I drive a HJ45 now, and paradoxically got a 12HT for it, so I will heed the advice from Watrob